WO2013069308A1 - Bloc-batterie - Google Patents

Bloc-batterie Download PDF

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Publication number
WO2013069308A1
WO2013069308A1 PCT/JP2012/007230 JP2012007230W WO2013069308A1 WO 2013069308 A1 WO2013069308 A1 WO 2013069308A1 JP 2012007230 W JP2012007230 W JP 2012007230W WO 2013069308 A1 WO2013069308 A1 WO 2013069308A1
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WO
WIPO (PCT)
Prior art keywords
safety valve
exhaust path
battery pack
gas
battery
Prior art date
Application number
PCT/JP2012/007230
Other languages
English (en)
Japanese (ja)
Inventor
啓介 清水
智彦 横山
藤川　万郷
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to US14/357,543 priority Critical patent/US9437854B2/en
Priority to JP2013542866A priority patent/JP5903607B2/ja
Priority to CN201280055475.XA priority patent/CN103931020B/zh
Publication of WO2013069308A1 publication Critical patent/WO2013069308A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/317—Re-sealable arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a battery pack including a plurality of secondary batteries.
  • a battery pack in which a plurality of batteries are accommodated in a case so that a predetermined voltage and capacity can be output is widely used as a power source for various devices and vehicles.
  • a technology has been adopted that can support a wide variety of applications by connecting general-purpose batteries in parallel or in series, modularizing assembled batteries that output a predetermined voltage and capacity, and combining these battery modules in various ways. I'm starting.
  • This modularization technology improves the workability when assembling the battery pack because the battery module itself can be reduced in size and weight by improving the performance of the battery accommodated in the battery module. Furthermore, it has various merits, such as an improved degree of freedom when mounted in a limited space such as a vehicle.
  • Patent Document 1 discloses a case in which a plurality of batteries are housed, a battery chamber that houses the batteries, and a discharge chamber that exhausts high-temperature gas released from the batteries, by a partition wall. And a power supply device including an exhaust mechanism having a configuration in which an opening of a safety valve of a battery is communicated with an exhaust chamber.
  • the exhaust mechanism By configuring the exhaust mechanism in this way, the high temperature gas released from the safety valve of the battery at the time of abnormality can flow into the exhaust chamber without flowing into the battery chamber, and can be discharged out of the case from the discharge port of the case. .
  • it can prevent that a surrounding battery is exposed to a high temperature state by filling a battery chamber with high temperature gas, and can reduce the influence which it has on a normal battery.
  • Patent Document 1 Since the exhaust mechanism described in Patent Document 1 isolates the exhaust chamber from the battery chamber, high temperature gas flowing into the discharge chamber from the opening of the battery can be prevented from coming into contact with the battery. It is excellent in that it can reduce general deterioration.
  • the safety valve operates by a rise in the internal pressure of the battery accompanying high temperature storage and repeated charge / discharge.
  • electrolyte solution and combustible gas are discharged from the safety valve.
  • the safety valve operates by generating gas at a relatively low temperature inside the battery.
  • the electrolytic solution and the combustible gas are discharged from the safety valve.
  • the hot gas is rapidly generated inside the battery, and the hot gas is discharged from the safety valve.
  • the plurality of battery safety valves described in Patent Document 1 communicate with one common exhaust chamber. Therefore, when the safety valve of the battery in which the abnormality has occurred operates and the high-temperature gas is discharged into the exhaust chamber, the electrolyte or combustible gas discharged in the initial stage from the battery in which the abnormality has occurred remains in the exhaust chamber. there is a possibility. Alternatively, there is a possibility that electrolyte solution or combustible gas discharged from another battery in which the safety valve is operated during normal use is present in the exhaust chamber.
  • the high-temperature gas discharged from the safety valve of the battery in which the abnormality has occurred into the exhaust chamber mixes with the electrolyte or combustible gas already present in the exhaust chamber, resulting in a rapid reaction with the combustible gas. May occur, and there may be a thermal influence on peripheral batteries and devices equipped with battery packs.
  • the present invention has been made in view of the above points, and the main object of the present invention is to provide a battery pack including a plurality of secondary batteries, in which an electrolytic solution discharged from the battery, a combustible gas, and a high-temperature gas are in the exhaust path. It is intended to prevent mixing and prevent thermal effects on peripheral batteries and devices equipped with battery packs.
  • a battery pack according to the present invention includes a plurality of secondary batteries arranged in the same direction, and each secondary battery includes a first safety valve and the first safety valve.
  • Each of the secondary batteries has a first safety valve connected to the first exhaust path, and each secondary battery has a second safety valve connected to the second exhaust valve.
  • the first exhaust path and the second exhaust path are connected to the path and are spatially separated from each other.
  • the first safety valve with a low operating pressure is activated by the pressure increase inside the battery during normal use or the gradual generation of gas at the initial stage in the event of an abnormality, and the electrolysis discharged from the first safety valve.
  • the liquid and the combustible gas flow into the first exhaust path connected to the first safety valve, and are further discharged out of the battery pack.
  • the second safety valve having a high operating pressure is activated by the rapid generation of the high-temperature gas at the time of abnormality, and the high-temperature gas discharged from the second safety valve is the second exhaust path connected to the second safety valve. And then discharged out of the battery pack.
  • the battery by providing the battery with two safety valves having different operating pressures according to the state of gas discharged from the battery, and connecting the two safety valves to two exhaust paths that are spatially separated from each other.
  • the high-temperature gas discharged from the battery and the electrolytic solution and the combustible gas can be separated from each other and discharged outside the battery pack. This prevents the hot gas discharged to the exhaust path from mixing with the electrolyte or combustible gas in the exhaust path, and has a thermal effect on peripheral batteries and devices equipped with battery packs. Can be reduced.
  • the present invention in a battery pack including a plurality of secondary batteries, it is possible to prevent the high temperature gas discharged to the exhaust path at the time of abnormality from being mixed with the electrolyte solution or the combustible gas in the exhaust path, As a result, it is possible to reduce the thermal influence on the peripheral battery or the device equipped with the battery pack.
  • (A) is sectional drawing which showed the structure of the unit cell used for the battery pack in one Embodiment of this invention
  • (b) is a bottom view of the unit cell used for the battery pack in this embodiment. It is sectional drawing which showed the structure of the battery pack in one Embodiment of this invention. It is sectional drawing which showed the structure of the unit cell in other embodiment of this invention. It is sectional drawing which showed the structure of the unit cell in other embodiment of this invention.
  • (A)-(c) is sectional drawing explaining the action
  • the battery pack of the present invention includes a plurality of secondary batteries arranged in the same direction, and each secondary battery includes a first safety valve and a second safety valve having a higher operating pressure than the first safety valve.
  • a first safety valve of each secondary battery is connected to the first exhaust path, and a second safety valve of each secondary battery is connected to the second exhaust path, respectively.
  • the second exhaust path are spatially separated from each other.
  • the battery is provided with two safety valves having different operating pressures according to the state of gas discharged from the battery, and the two safety valves are connected to two exhaust paths that are spatially separated from each other.
  • the gas discharge amount per unit time when the first safety valve is operated is smaller than the gas discharge amount per unit time when the second safety valve is operated.
  • the opening area of the first safety valve when the first safety valve is activated is preferably smaller than the opening area of the second safety valve when the second safety valve is activated. Therefore, it is possible to easily realize that the gas discharge amount per unit time when the first safety valve is operated is smaller than the gas discharge amount per unit time when the second safety valve is operated.
  • the opening area of the first safety valve when the first safety valve is activated is equal to or less than 1/10 of the opening area of the second safety valve when the second safety valve is activated. Preferably, it is preferable that it is 1/20 or less. Thereby, when the pressure of the high-temperature gas generated in the battery is increased and the second safety valve is activated, it is possible to almost suppress the discharge of the high-temperature gas to the first exhaust path.
  • the first safety valve is closed at least when the second safety valve is operated.
  • the second safety valve is activated, it is possible to reliably prevent the hot gas from being discharged into the first exhaust path.
  • the plurality of secondary batteries are housed in a case
  • the first safety valve is provided on one end side of the secondary battery
  • the second safety valve is a secondary battery other than the secondary battery.
  • the case is provided with a first partition wall disposed on one end side of the secondary battery, and a second partition wall disposed on the other end side of the secondary battery.
  • the exhaust path is divided into a housing part for housing a plurality of unit cells, and a second exhaust path. Thereby, the first exhaust path and the second exhaust path can be spatially separated from each other.
  • At least one of a gas absorbent, a fire extinguishing agent, and a coolant is installed in the first exhaust path or the second exhaust path.
  • At least one of a temperature sensor and a gas detection sensor is installed in the first exhaust path or the second exhaust path.
  • a temperature sensor and a gas detection sensor is installed in the first exhaust path or the second exhaust path.
  • the second exhaust path is made of a heat-resistant material or a flame retardant material.
  • the high temperature gas passes through the storage section that stores the unit cell or the storage section due to deformation or damage of the second exhaust path due to the heat of the high temperature gas. Therefore, it is possible to prevent the first exhaust path from flowing out.
  • the unit cell housed in the housing unit from being exploded by the high temperature gas, and mixing the electrolyte solution and the combustible gas existing in the first exhaust path with the high temperature gas.
  • the second exhaust path has a structure that is more airtight than the first exhaust path.
  • the first exhaust path has a first discharge port for discharging the gas discharged from the first safety valve to the outside, and the second exhaust path passes the gas discharged from the second safety valve to the outside. It is preferable that the pressure loss of the gas passing through the second exhaust path is smaller than the pressure loss of the gas passing through the first exhaust path.
  • Unit cell> 1A and 1B are cross-sectional views schematically showing the configuration of a unit cell 100 used in a battery pack according to an embodiment of the present invention. (Hereinafter, the battery used for the battery pack is referred to as a “unit cell”).
  • the unit cell 100 used in the battery pack of the present invention can employ, for example, a cylindrical lithium ion secondary battery as shown in FIG.
  • a lithium ion secondary battery is provided with a safety mechanism that releases gas to the outside of the battery when the pressure in the battery increases due to an internal short circuit or the like.
  • a specific configuration of the unit cell 100 will be described with reference to FIGS.
  • an electrode group 4 in which a positive electrode 1 and a negative electrode 2 are wound through a separator 3 is housed in a battery case 7 together with a non-aqueous electrolyte (not shown).
  • Insulating plates 9, 10 are arranged above and below the electrode group 4, the positive electrode 1 is joined to the filter 12 via the positive electrode lead 5, and the negative electrode 2 is connected to the negative electrode terminal 6 via the negative electrode lead 6. Is joined to the bottom.
  • the filter 12 is connected to the inner cap 13, and the protrusion of the inner cap 13 is joined to a metal exhaust valve 14. Further, the exhaust valve 14 is connected to a terminal plate 8 that also serves as a positive terminal. The terminal plate 8, the exhaust valve 14, the inner cap 13, and the filter 12 are integrated to seal the opening of the battery case 7 via the gasket 11.
  • the exhaust valve 14 is formed with a thin portion 14a that breaks when the pressure in the unit cell reaches a predetermined value. Further, when the exhaust valve 14 is broken, the filter 12 has a filter hole 12a, the inner cap 13 has an opening 13a, and the terminal plate 8 has a discharge hole so that the gas generated in the unit cell is discharged to the outside. Exhaust ports 8a are respectively formed.
  • the exhaust valve 14, the filter 12, the inner cap 13, and the terminal plate 8 constitute a first safety valve. For this reason, the operating pressure of the first safety valve is a pressure at which the thin wall portion 14a is broken.
  • the opening area of the first safety valve is the minimum area of the opening formed by the breakage of the filter hole 12a, the opening 13a, the exhaust port 8a, and the thin portion 14a, which is a passage for the gas generated inside the unit cell. Determined.
  • a thin stamped portion 15 a that breaks when the pressure in the battery reaches a predetermined value is formed at the bottom of the battery case 7, and is formed at the bottom of the battery case 7.
  • the thin safety marking portion 15a constitutes a second safety valve.
  • the breaking pressure of the thin stamped portion 15a formed on the bottom of the battery case 7 is formed to be larger than the breaking pressure of the thin portion 14a formed on the exhaust valve 14. That is, the operating pressure of the second safety valve is set higher than the operating pressure of the first safety valve. Further, the opening area formed in the battery case 7 when the thin stamped portion 15a formed on the bottom of the battery case 7 is broken becomes the opening area of the second safety valve.
  • the exhaust valve 14 When the pressure in the unit cell 100 rises, the exhaust valve 14 swells toward the terminal plate 8, and when the inner cap 13 and the exhaust valve 14 are disconnected, the current path is interrupted. When the pressure in the unit cell 100 further increases, the exhaust valve 14 is broken. As a result, the gas generated in the unit cell 100 passes through the filter hole 12 a of the filter 12, the opening 13 a of the inner cap 13, the broken portion of the thin portion 14 a of the exhaust valve 14, and the exhaust port 8 a of the terminal plate 8. And discharged to the outside.
  • the “safety valve” includes a mechanism having a function of exhausting the gas generated in the battery to the outside of the battery when the pressure in the battery rises. It is not necessarily limited to the illustrated form.
  • the battery is sealed with a gasket or packing that is cleaved at a specific pressure, or the battery is sealed with an elastic body such as a resin or a spring pressed against the opening of the battery case. It is possible to employ a configuration in which gas is exhausted to the outside through a gap generated by deformation of the elastic body due to pressure increase.
  • FIG. 2 is a cross-sectional view schematically showing the configuration of the battery pack 200 in one embodiment of the present invention.
  • the battery pack 200 has a configuration in which a plurality of unit cells 100 are accommodated in the pack case 20.
  • the unit cells 100 are arranged in the same direction, and are fixed at restricted positions by spacers 40 formed inside the accommodating portion 30.
  • the unit cell 100 includes an exhaust port 8a that is a release portion of a first safety valve that discharges gas generated in the unit cell 100 to the outside of the unit cell.
  • a thin stamped portion 15a which is a release portion of the second safety valve.
  • the pack case 20 includes a first partition wall 51 disposed on one end side of the plurality of unit cells 100 (in the present embodiment, the terminal plate 8 side) and the other end side of the unit cells 100 (in the present embodiment,
  • the second partition wall 61 disposed on the thin stamped portion 15a side) accommodates the plurality of unit cells 100, and the gas discharged from the exhaust port 8a of the unit cells 100 to the first discharge port 53.
  • the first exhaust path 50 for exhausting the gas from the pack case 20 to the outside, and the second exhaust path for exhausting the gas exhausted from the thin stamped portion 15a side of the unit cell 100 to the outside of the pack case 20 from the second exhaust port 63 There are 60 sections.
  • the 1st discharge port 53 and the 2nd discharge port 63 are formed in the different side surface of the pack case 20, and are the arrangement
  • the exhaust port 8a of the unit cell 100 communicates with the first exhaust path 50 via the first connection path 54 formed in the first partition wall 51.
  • the first exhaust path 50 is It is formed between the 1st division wall 51 and the 1st exterior plate 52 used as the upper cover of the pack case 20.
  • FIG. Similarly, the thin stamped portion 15 a of the unit cell 100 communicates with the second exhaust path 60 via the second connection path 64 formed on the second partition wall 61, and the second exhaust path 60. Is formed between the second partition wall 61 and the second exterior plate 62 serving as the lower lid of the pack case 20.
  • the first partition wall 51 and the second partition wall 61 are in close contact with the end of the unit cell 100 (in this embodiment, the end on the terminal plate 8 side and the end of the bottom of the battery case 7). Therefore, the accommodating portion 30 is sealed by the first partition wall 51 and the second partition wall 61. Therefore, the gas released from the exhaust port 8a and the thin stamped portion 15a of the unit cell 100 does not flow into the accommodating portion 30.
  • the battery pack 200 is formed at the bottom of the battery case 7.
  • the electrolyte or combustible gas inside the battery is discharged from the exhaust port 8a to the first exhaust path 50.
  • the internal pressure of the unit cell 100 also increases abruptly. Therefore, the thin stamped portion 15a formed at the bottom of the battery case 7 having a high breaking pressure is also broken, and the second High-temperature gas is discharged from the thin stamped portion 15a, which is the release portion of the safety valve, to the second exhaust path 60 through the second connection path 64 formed in the second partition wall 61.
  • the high temperature gas passes through the second exhaust path 60 and is discharged from the second discharge port 63 to the battery pack 200. It is discharged outside.
  • the electrolytic solution or the combustible gas discharged from the unit cell 100 or the surrounding battery before the high temperature gas is generated in the unit cell 100 passes through the first exhaust path 50 and passes through the first discharge port 53 to the battery pack 200. Since it is discharged to the outside, a rapid reaction is caused by mixing a high temperature gas with an electrolyte or combustible gas inside the battery pack 200, thereby preventing thermal influence on the surrounding battery and the pack-equipped device. it can.
  • the battery pack 200 includes a plurality of unit cells (secondary cells) 100 arranged in the same direction, and each unit cell 100 includes a first safety valve and a first safety valve.
  • the first safety valve of each unit cell 100 is connected to the first exhaust path 50, and the second safety valve of each unit cell 100 is the second safety valve having a higher operating pressure than the safety valve.
  • the first exhaust path 50 and the second exhaust path 60 are spatially separated from each other.
  • the unit cell 100 is provided with two safety valves having different operating pressures, and the two safety valves are two spatially separated from each other.
  • the gas discharge amount per unit time when the first safety valve is operated is smaller than the gas discharge amount per unit time when the second safety valve is operated.
  • the hot gas generated in the unit cell 100 is increased and the second safety valve is activated, the hot gas is exhausted exclusively to the second exhaust path 60 and enters the first exhaust path 50. Is hardly discharged. Even if the high temperature gas is discharged to the first exhaust path 50, the amount of the high temperature gas is small and the heat capacity is very small. The temperature of the high-temperature gas absorbed by air or the like existing in the first exhaust path 50 cannot maintain a temperature that causes a rapid reaction with the electrolytic solution or the combustible gas. As a result, even if high-temperature gas is exhausted to the first exhaust path 50, it is prevented from mixing with the electrolyte solution or combustible gas existing in the first exhaust path 50 and causing a rapid reaction. Can do.
  • FIG. 3 is a cross-sectional view showing a configuration of a unit cell 102 according to another embodiment of the present invention.
  • the filter hole 12 a of the filter 12 is configured to be smaller than the opening area of the second safety valve formed by breaking the thin stamped portion 15 a of the battery case 7. Yes.
  • the opening area of the first safety valve is formed by the breakage of the filter hole 12a, the opening 13a, the exhaust port 8a, and the thin-walled portion 14a that are passages for the gas generated inside the unit cell. Determined by the minimum area of the opening.
  • the opening area of the filter hole 12a is configured to be the opening area of the first safety valve.
  • the discharge amount per unit time of the high temperature gas discharged from the first safety valve and the second safety valve is substantially proportional to the opening area of the safety valve. ing. Therefore, as the opening area of the first safety valve becomes smaller than the opening area of the second safety valve, the amount of high-temperature gas discharged from the first safety valve into the first exhaust path 50 is reduced.
  • the inventors of the present application have found that if the opening area of the first safety valve is 1/10 or less, more preferably 1/20 or less of the opening area of the second safety valve, Even when the generated high-temperature gas is discharged into the first exhaust path 50, a rapid reaction due to mixing of the electrolyte solution or combustible gas and the high-temperature gas in the first exhaust path 50 cannot occur. discovered.
  • the battery pack 200 contains the unit cell 102 in which the opening area of the first safety valve is smaller than the opening area of the second safety valve (preferably 1/10 or less, more preferably 1/20 or less).
  • the electrolytic solution and the combustible gas are discharged from the first safety valve of the unit cell 101 into the first exhaust path 50, and then the high temperature gas is discharged from the second safety valve to the second exhaust path.
  • the high temperature gas generated in the unit cell 102 flows into the first exhaust path 50 from the exhaust port 8a that is the opening of the first safety valve.
  • the opening area of the safety valve (in this embodiment, the opening area of the filter hole 12a) is the opening area of the second safety valve (in this embodiment, the opening area formed in the battery case 7 when the thin stamped portion 15a is broken).
  • FIG. 4 is a cross-sectional view showing a configuration of a unit cell 101 according to another embodiment of the present invention.
  • an exhaust port 8 a that is a release portion of the first safety valve is provided in the center portion of the terminal plate 8.
  • FIG. 5 (a) is a diagram showing a state in which the first safety valve is activated in the initial stage of gas generation.
  • the temperature of the unit cell gradually rises due to overcharge or the like, and the electrolyte in the battery case 7 is vaporized or decomposed.
  • the thin portion 14a is broken.
  • the gas generation at this stage is relatively low temperature and gentle, and the thin part 14a of the exhaust valve 14 is broken, so that the electrolyte and the combustible gas are exhausted out of the battery through the exhaust port 8a of the terminal plate 8.
  • FIG. 5B is a diagram showing a state in which the first safety valve is closed at a stage where the battery is in a higher temperature state, a rapid chemical reaction occurs inside the battery, and a high temperature gas is generated abruptly. .
  • a part of the broken exhaust valve 14 is deformed by an increase in pressure due to a high-temperature gas ejected in a large amount, and is pushed up toward the terminal plate 8 to close the exhaust port 8a.
  • the end of the broken portion of the exhaust valve 14 needs to be in contact with the terminal plate 8. Therefore, the size of the exhaust port 8a is considered.
  • the distance between the terminal plate 8 and the exhaust valve 14, the position where the thin portion 14a of the exhaust valve 14 is formed, etc. may be determined as appropriate.
  • FIG. 5 (c) is a diagram showing a state in which the second safety valve is activated when the pressure in the unit cell is further increased in a state where the first safety valve is closed. Since the gas exhaust from the first safety valve is hindered, the pressure in the unit cell rapidly increases, and the pressure in the unit cell is the breaking pressure of the thin stamped portion 15a of the battery case 7 (the operation of the second safety valve). If the pressure exceeds, the thin stamped portion 15a is broken and the high temperature gas generated in the unit cell is discharged outside the battery through the broken portion of the thin stamped portion 15a of the battery case 7.
  • the battery pack 200 When the battery pack 200 is configured to contain the unit cell 101 having a structure in which the first safety valve is closed when the second safety valve is operated, the electrolyte solution or the combustible material from the first safety valve of the unit cell 101 for some reason.
  • the gas is discharged into the first exhaust passage 50 and then the hot gas is discharged from the second safety valve into the second exhaust passage 60, the hot gas is discharged from the second safety valve. Since the first safety valve is closed in the state, it is possible to prevent the hot gas generated in the unit cell 101 from flowing into the first exhaust path. Thereby, it can prevent reliably that electrolyte solution and combustible gas in the 1st exhaust path 50 mix with high temperature gas.
  • blocking of the first safety valve does not necessarily mean complete blocking, and high-temperature gas generated in the battery after the operation of the second safety valve is discharged from the first safety valve. It is only necessary to limit the opening area of the first safety valve to such an extent that it can be prevented.
  • FIG. 6 is a cross-sectional view showing a configuration of a battery pack 201 according to another embodiment of the present invention.
  • a gas absorbent 70 is installed in the first exhaust path 50 in the battery pack 201.
  • the battery pack 201 has such a configuration, when the electrolytic solution or the combustible gas flows into the first exhaust path 50, the electrolytic solution or the combustible gas is absorbed by the gas absorbent 70.
  • the solution and the combustible gas from flowing out of the first exhaust path 50 and mixing with the high-temperature gas generated at the time of abnormality.
  • the electrolytic solution and the combustible gas are absorbed by the gas absorbent 70, so that the electrolytic solution and the combustible gas enter the housing portion 30 through the gap between the first partition walls 51 and come into contact with the unit cell 100. 7 can be prevented from corroding.
  • the configuration in which the gas absorbent 70 is installed in the first exhaust path 50 has been described as a specific example, but the present invention is not limited to this.
  • a fire extinguishing agent may be installed in the first exhaust path 50.
  • the first exhaust path 50 has The fire-extinguishing agent can reduce the thermal effect on the surrounding battery and the pack-mounted equipment.
  • a configuration in which a coolant is installed in the first exhaust path 50 may be adopted.
  • the hot gas is cooled in the path by the coolant in the first exhaust path 50.
  • the electrolyte solution or the combustible gas flowing into the first exhaust path 50 and the high-temperature gas are mixed to cause an abrupt reaction, thereby preventing the surrounding battery and the pack-mounted device from being thermally affected.
  • a gas absorbent, a fire extinguisher, and a coolant may be installed in the second exhaust path 60.
  • the electrolyte, the combustible gas, and the high-temperature gas are mixed as in the case of being installed in the first exhaust path 50.
  • FIG. 7 is a cross-sectional view showing a configuration of a battery pack 202 according to another embodiment of the present invention.
  • a temperature sensor 71 is installed in the second exhaust path 60 of the battery pack 202.
  • the temperature in the second exhaust path 60 is high temperature gas. rise by.
  • the temperature sensor 71 By detecting the temperature rise in the second exhaust path 60 with the temperature sensor 71, it is possible to accurately detect that an abnormality has occurred in the unit cell 100 in the battery pack 202. Thereby, even when an abnormality occurs in the unit cell 100 in the battery pack 202, it is possible to quickly take safety measures for the pack-equipped device.
  • the configuration in which the temperature sensor 71 is installed in the second exhaust path 60 has been described as a specific example, but the present invention is not limited to this.
  • a gas sensor may be installed in the second exhaust path 60.
  • a gas sensor or a temperature sensor may be installed in the first exhaust path 50.
  • FIG. 8 is a cross-sectional view showing a configuration of a battery pack 203 according to another embodiment of the present invention.
  • a part of the second exterior plate 62 that forms the second exhaust path 60 in the battery pack 203 is composed of a heat-resistant material 72.
  • the high temperature gas may be in the second exterior plate 62 or the like. It is possible to prevent the contact portion from being deformed or damaged by the heat of the high-temperature gas.
  • the heat-resistant material may be any material that can maintain physical properties even when exposed to the heat of a high-temperature gas.
  • a metal material such as iron or aluminum, or a heat resistant resin such as glass epoxy resin, polyphenylene sulfide, or polyarylate can be used.
  • a part of the second exterior plate 62 forming the second exhaust path 60 is configured by the heat-resistant material 72
  • the present invention is limited to this. is not.
  • a part of the second exterior plate 62 that forms the second exhaust path 60 may be made of a flame retardant material.
  • the member that forms the second exhaust path 60 such as the second exterior plate 62 is provided. It is possible to prevent deformation and damage caused by burning the contacted portion.
  • the flame retardant as used herein may be a material that does not impair physical properties by combustion when exposed to the heat of a high-temperature gas.
  • a ceramic, glass, a flame-retardant fiber board, a flame-retardant plywood, etc. are mentioned.
  • FIG. 9 is a cross-sectional view showing a configuration of a battery pack 204 according to another embodiment of the present invention.
  • the packing 73 is provided in the gap between the unit cell 100 and the second partition wall 61 so that the second exhaust path 60 is more airtight than the first exhaust path 50. It has a structure.
  • a high temperature gas is generated from the unit cell 100 in an abnormal state, and the high temperature gas flows into the second exhaust path 60, and the pressure in the second exhaust path 60 is increased by the high temperature gas. Even when the temperature rises, high temperature gas can be prevented from entering the housing portion 30 through the gap between the unit cell 100 and the second partition wall 61.
  • the high temperature gas flows into the first exhaust path 50 through the storage unit 30 and further through the storage unit 30, and turns into the unit cell 100 in the storage unit 30 and the electrolyte and combustible gas in the first exhaust path 50. Contacting can be effectively prevented.
  • FIG. 10 is a cross-sectional view showing a configuration of a battery pack 205 according to another embodiment of the present invention.
  • the second exhaust path 60 has a larger path area than the first exhaust path 50, and the second exhaust path 60 is larger than the first exhaust path 50.
  • the members forming the second exhaust path 60 such as the second partition wall 61 and the second exterior plate 62 from being deformed or damaged due to the pressure increase in the second exhaust path 60.
  • the hot gas flows from the deformed or damaged part of the second exhaust path 60 into the first exhaust path 50 through the outside of the pack, the accommodating part 30 or the accommodating part 30, and the element in the accommodating part 30 is Contact with the electrolyte solution or combustible gas in the battery 100 or the first exhaust path 50 can be effectively prevented.
  • connection path connecting the safety valve and the exhaust path of each battery may be formed by a hollow member connected to the unit cell, or may be formed by extending a part of a battery member such as a battery case.
  • the positional relationship between the first outlet and the second outlet may be an arrangement in which the gases exhausted from the respective outlets are difficult to mix.
  • one discharge port may be provided inside the battery pack mounting device, and the other discharge port may be provided outside the battery pack mounting device.
  • the arrangement of the unit cells accommodated in the battery case may be zigzag, curved, or bent in the middle of the arrangement in addition to the linear arrangement.
  • the number of unit cells per battery pack is not particularly limited as long as it is two or more.
  • the structure on the case body side of the battery pack is not particularly limited.
  • the battery pack of the present invention is suitably used as a power source for portable electronic devices such as personal computers and mobile phones, hybrid electric vehicles, and electric tools.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Battery Mounting, Suspending (AREA)
  • Secondary Cells (AREA)

Abstract

L'invention porte sur un bloc-batterie (200), lequel bloc comporte une pluralité de cellules unitaires (100). La pluralité de cellules unitaires (100) sont agencées de façon à avoir la même orientation les unes par rapport aux autres, et chaque cellule unitaire (100) a une première soupape de sécurité et une seconde soupape de sécurité qui a une pression de travail supérieure à celle de la première soupape de sécurité. Les premières soupapes de sécurité des cellules unitaires (100) sont respectivement reliées à une première trajectoire d'évacuation (50), et les secondes soupapes de sécurité des cellules unitaires (100) sont respectivement reliées à une seconde trajectoire d'évacuation (60). La première trajectoire d'évacuation (50) et la seconde trajectoire d'évacuation (60) sont séparées dans l'espace l'une de l'autre.
PCT/JP2012/007230 2011-11-11 2012-11-12 Bloc-batterie WO2013069308A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US14/357,543 US9437854B2 (en) 2011-11-11 2012-11-12 Battery pack
JP2013542866A JP5903607B2 (ja) 2011-11-11 2012-11-12 電池パック
CN201280055475.XA CN103931020B (zh) 2011-11-11 2012-11-12 电池组

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-247182 2011-11-11
JP2011247182 2011-11-11

Publications (1)

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WO2013069308A1 true WO2013069308A1 (fr) 2013-05-16

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US (1) US9437854B2 (fr)
JP (1) JP5903607B2 (fr)
CN (1) CN103931020B (fr)
WO (1) WO2013069308A1 (fr)

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US12068468B2 (en) 2020-12-24 2024-08-20 Contemporary Amperex Technology Co., Limited Battery module and manufacturing method and device thereof, battery pack, and power consumption apparatus
WO2022224660A1 (fr) * 2021-04-22 2022-10-27 パナソニックホールディングス株式会社 Bloc-batterie pour outil électrique, et outil électrique
US11901555B2 (en) 2021-07-30 2024-02-13 Contemporary Amperex Technology Co., Limited Battery module, battery pack, and electric apparatus

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US9437854B2 (en) 2016-09-06
JPWO2013069308A1 (ja) 2015-04-02
US20140308550A1 (en) 2014-10-16
CN103931020B (zh) 2016-08-17
CN103931020A (zh) 2014-07-16
JP5903607B2 (ja) 2016-04-13

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